Q. The dimensions of Planck's constant are:

  • (A) [ML²Tโป¹]
  • (B) [MLTโป²]
  • (C) [ML²Tโป²]
  • (D) [MโฐLTโป¹]
๐Ÿ“ Notes
โœ… Correct Answer: (A) [ML²Tโป¹]
Explanation: Planck's constant h = Energy × Time = [ML²Tโป²] × [T] = [ML²Tโป¹].

Q. The mirror used in vehicle rear-view mirrors is:

  • (A) Plane mirror
  • (B) Convex mirror
  • (C) Concave mirror
  • (D) Cylindrical mirror
๐Ÿ“ Notes
โœ… Correct Answer: (B) Convex mirror
Explanation: Convex mirrors provide a wider field of view and form erect, diminished images.

Q. Which electromagnetic wave has the highest frequency?

  • (A) Microwaves
  • (B) Infrared rays
  • (C) X-rays
  • (D) Gamma rays
๐Ÿ“ Notes
โœ… Correct Answer: (D) Gamma rays
Explanation: Gamma rays have the highest frequency and shortest wavelength in the electromagnetic spectrum.

Q. The principle of conservation of linear momentum follows directly from:

  • (A) Newton's First Law
  • (B) Newton's Second Law
  • (C) Newton's Third Law
  • (D) Law of Gravitation
๐Ÿ“ Notes
โœ… Correct Answer: (C) Newton's Third Law
Explanation: Conservation of momentum is a consequence of Newton's Third Law of Motion.

Q. A body moving in a circular path with constant speed possesses:

  • (A) No acceleration
  • (B) Constant acceleration
  • (C) Centripetal acceleration
  • (D) Tangential acceleration only
๐Ÿ“ Notes
โœ… Correct Answer: (C) Centripetal acceleration
Explanation: Even at constant speed, velocity changes direction continuously, producing centripetal acceleration.

Q. The escape velocity is independent of:

  • (A) Mass of the planet
  • (B) Radius of the planet
  • (C) Mass of the object
  • (D) Gravitational constant
๐Ÿ“ Notes
โœ… Correct Answer: (C) Mass of the object
Explanation: Escape velocity v = √(2GM/R) and does not depend on the mass of the escaping object.

Q. The time period of a simple pendulum depends on:

  • (A) Mass of bob
  • (B) Amplitude
  • (C) Length of pendulum
  • (D) Shape of bob
๐Ÿ“ Notes
โœ… Correct Answer: (C) Length of pendulum
Explanation: The time period T = 2π√(L/g), so it depends on length and acceleration due to gravity.

Q. The equivalent resistance of two resistors R and R connected in parallel is:

  • (A) R
  • (B) 2R
  • (C) R/2
  • (D)
๐Ÿ“ Notes
โœ… Correct Answer: (C) R/2
Explanation: For two equal resistors in parallel, Req = R/2.

Q. Which of the following particles has no electric charge?

  • (A) Electron
  • (B) Proton
  • (C) Neutron
  • (D) Positron
๐Ÿ“ Notes
โœ… Correct Answer: (C) Neutron
Explanation: Neutrons are electrically neutral particles present inside the nucleus.

Q. The slope of a velocity-time graph represents:

  • (A) Displacement
  • (B) Speed
  • (C) Acceleration
  • (D) Momentum
๐Ÿ“ Notes
โœ… Correct Answer: (C) Acceleration
Explanation: The slope of a velocity-time graph gives acceleration.

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